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Write the word TRUE if the statement is correct and if not, underline the word or statement that make the sentence incorrect and write the correct answer on the space provided.
1. Electrostatics, as the name implies, is the study of moving electric charges.
2. The word electrostatics comes from the Greek word “elektron".
3. The ancient Greeks discovered the electric charge as early as 600 B.C.
4. An ion is an atom that has lost or gained one or more electrons.
5. Surrounding the nucleus are the electrons, which orbit the nucleus out to distances on the order of 10-10 m.
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- In 1911, Ernest Rutherford and his assistants Geiger and Marsden conducted an experiment in which they scattered alpha particles (nuclei of helium atoms) from thin sheets of gold. An alpha particle, having charge +2e and mass 6.64 10-27 kg, is a product of certain radioactive decay's. The results of the experiment led Rutherford to the idea that most of an atoms mass is in a very small nucleus, with electrons in orbit around it. (This is the planetary model of the atom, which well study in Chapter 42.) Assume an alpha particle, initially very far from a stationary gold nucleus, is fired with a velocity of 2.00 107 m/s directly toward the nucleus (charge +79e). What is the smallest distance between the alpha particle and the nucleus before the alpha particle reverses direction? Assume the gold nucleus remains stationary.Which of the following statements is not a property of electric charge? a. Electric charge is conserved. b. Electric charge is quantized. c. The magnitude of the electric force between two point charges is inversely proportional to the product of the magnitude of the charges. dl. A positive charge and a negative charge will attract each other. e. A pair of positive charges repel each other.Describe your approach to determining the distance between the electron and proton in an atom if the potential energy U of the electron is known to be 14 eV. a. Use Coulomb's law. b. Use the definition of electrostatic potential energy U of one point charge q at position r in the presence of an electric potential. O c. Use Newton's second law. O d. Use the law of conservation of energy.
- 1. In a hydrogen atom the electron 'orbits' the nucleus (or proton) of the atom at about 1 angstrom (1*10-10 m). A. What is the electric field at the position of the electron and proton? b. What is the electric Force felt by both the electron and the proton? c. What's the difference? d. What is the gravitational force acting upon both the electron and the proton? e. Which one is stronger the electric force or the gravitational force?a. Calculate the electric force and gravitational force between the proton and the electron for a Hydrogen atom. b. What is the speed of the electron for a Hydrogen atom (ignore the force of gravity between the two particles.) c. How much extra energy is needed for the Electron to escape and create an H* ion? electron proton5. Electron spins around a nucleus of an atom. What is the charge of an electron? а. -1.06 х 10^-19 С b. -6.10 x 10^-19 С с. -1.60 х 10^-19 С d. -1.60 x 10^19 C 6. What do you call the law that quantifies the force of attraction and repulsion between charged bodies? a. Newton's Law b. Cavendish's Law c. Coulomb's Law d. Faraday's Law 7. The direction of electric field due +Q positive charge is a. away from the charge b. towards the charge c. Both A and B d. None of the above 8. The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be а. 600 N/C b. 400 N/C c. 800 N/C d. 1200 N/C
- Describe your approach to determining the distance between the electron and proton in an atom if the potential energy U of the electron is known to be 14 eV. а. Use the law of conservation of energy. b. Use Coulomb's law. С. Use the definition of electrostatic potential energy U of one point charge q at position r in the presence of an electric potential. d. Use Newton's second law.5. The image on the right is Set D (Model 3). a. Draw an electron to the left of the 2 protons. b. Predict the force of attraction on the original electron and the second electron. Explain your prediction in a complete 0.10 nm sentence. Page 3:56 PM 3/14/20211. What is the electrical nature of electron? 2. What is the electrical nature of proton? 3. It is equal to the work done in placing charges into an E field.
- Which answer is correct? Question 1 Both William Crookes and J.J. Thomson struggled first to show that cathode rays were deflected by the electric field; this can be explained by the fact that A. without a low pressure gas, ionized gas molecules would create their individual electric fields that would decrease the net electric field. B. the cathode rays were too heavy to be deflected. C. they could not achieve enough magnitude of the electric field. D. there was a good vacuum in the chamber that prevented air drag. Question 2 The Millikan experiment was complicated by the fact that: A. the oil droplets were too light and hence accelerated too high velocities by the electric field. B. oil droplets were randomly charged. C. the viscosity of air was not known that time. D. the mass of the droplets could not be easily determined.1. Will two neutral objects experience an electrical interaction? What is your evidence? 2. Describe how an insulator can acquire a charge.Q2: In the Bohr model of a hydrogen atom, a single electron orbits a single proton at a radius of 5.29x10 l m. The mass of a proton is 1.67x10 27 kg, the mass of an electron is 9.11x10 31 kg. A. Calculate the electrical force between the proton and the electron. B. Calculate the gravitational force between the proton and the electron.
